code: def filter_padding(self, traces):
      for i in range(len(traces)):
          traces[i] = [x for x in traces[i] if x != -1]
  
file_path: dgl/examples/pytorch/eges/sampler.py
imports: import dgl
  import numpy
  import torch
label_desc: Use image node_id 3 for calling the Sampler obj's underlying member method code with example usage: obj.filter_padding(traces) without return types